Defying scepticism and geek-stigma, mobile phone firms are determined this year to sell you a wristwatch wirelessly connected to your mobile phone.

Numerous models have hit the market over the past year but 2015 will see an explosion, analysts say, with manufacturers making their watches and other wearable connected devices more elegant and useful.

US giant Apple's release of its first "smartwatch" - expected by April - is set to make 2015 a "tipping point for wearables", research group CCS Insight said in a report.

In anticipation of that launch, Apple's Asian rivals scrambled to unveil their own connected wrist gadgets in Barcelona on Sunday on the eve of the World Mobile Congress trade show in Barcelona.

South Korean manufacturer LG released the Urbane LTE, its first fully connected luxury wristwatch which can make and receive calls - either with a wireless headset, or by speaking into your wrist like the comic book detective Dick Tracy.

Unlike most smartwatch models, the chunky Urbane LTE version has its own network SIM card with a mobile connection and so can be used for calls, without needing to be linked to a smartphone.